Benedictine Sister Mary (Mary Dennis) Collins, 88, died May 2 at Mount St. Scholastica Monastery in Atchison, Kansas.

Born in Chicago, Sister Mary entered the Benedictine Sisters of Mount St. Scholastica, Atchison, Kansas, in 1957 after graduating from Mount St. Scholastica College. She taught high school for several years before beginning her doctoral studies at the Catholic University of America. After earning a doctorate in liturgical theology, she taught religious studies at Benedictine College and the University of Kansas.

In 1967, she became associate professor of religious studies at the Catholic University of America and in 1983 became chair of the religion department. After a short period in North Carolina, she returned in 1987 to the Catholic University of America, where she taught until she was elected prioress of Mount St. Scholastica Monastery in 1999. A significant figure in the broader world of Benedictine women, she was first councilor for the Federation of St. Scholastica for twelve years and a consultant or author for many of their documents.

Sister Mary was a member of the International Commission on English in the Liturgy and belonged to several professional theological organizations. She wrote, collaborated on, or edited a large number of articles and books on religion and liturgy for which she was widely known.

She is survived by her brother, John Collins.